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www uitetl 51am' r se. atmltlttiiw JOHN VV.y GARVER AND CHARLES A. B1KLE,`OF HAGERSTOWN,

i l MARYLAND.

Letters Patent No. 86.746, dated February 9,- 1869.

The Schedule referred-,to in these Le'ttexsQPatent and making part of the same.

To all whom it may conce/ra:

Beit known that we, JOHN W. Gar. van and CHARLns A. BIKLE, of Hagerstown, in the county of Washington, and 4State of Maryland, have invented anew and useful Improvement in Threshing-lviachines; and we do hereby declare that the following is a full and exact description thereof, reference being had to the acecmpanying drawings, and te the letters oi' reference marked thereon.

Our invention consists in a novel construction and arrangement of threshingeinaehines.

In the accompanying drawings Figure 1 is a vertical longitudinal ysectionof our threshing-1nacl1ine.

Figure 2 is a detached View of the metallic plate holding the cylinder.

In the construction oi' our threshing-machine, the

main frame and threshing-cylinder may be of the usual construction.

We also employ' a celled and ribbed apron, A, to carry the straw, grain, and chaff to the separator.

This apron A is made wider than the length of the threshing-cylinder, so as to project on both sides and the metallic head-piece B is-made with a curve outward, as seen at b, fig. 2, inorder to preventthe grain and chan" from leaking over the edges of the apron, and also to give a wider separating surface.

A series of separating-rakes, D, are arranged upon two cranks, E, having four bearings each. These bearings are placed at right angles in the same cra-nk, and the two cranks set at corresponding angles, so to make both ends of a rake-head or bar rise and fall at thesame time. u

Between the .takes are intermediate bars G, with holes g, to allow the grain to fall through.

4At each end of the fan we employ. a peculiar form of register, O, shown in fig. l, the openings into the fan and the form of the register being such as to close or open rapidly the air-spaces near the circumference of the fan, while the air-spaces near the centre of' the fan are slowly opened and closed.

By' this arrangement, when a small amount of air is admitted to the fan, a greater proportion of the air enters near the centre, and thus is able to reach the middle ofthe machine, and prevent an excess of blast at the ends of the fans, and a weak blast near the middie of themachine.4

For the purpose of operating this register by the blast itself, and for keeping a, balance between the speed of the fan and the amount of air admitted, we have pivoted a board, H, in the fan-case,in such manner that a strong blast will swing the board back from 'the fan, and thus, by means of' a link, I, connecting the board to the register, the latter is closed. When the speed diminishes, this board, by its own weight, swings down, and immediately opens thel register. Thus strength ofthe blast is'kept uniformly the same, whether the speed of the machine is greater or less.

By means of a ribbed roller, K, chai and other iinpnrties are carried over, and thus Vseparated from the gram. l

Near this roller is placed a concave board, which receives grain and impurities, and holds the same in the blast until the good grain backs oft' against the blast Aarating space, substantially as set forth.

2. The apron A and intermediate bars G,'with holes, in combination with the rakes Working upon two cranks, with hearin gs at dibrent angle-s, to avoid dead-centres, substantially as set forth.

3. A register, so arranged and operated as to cnt oil" the admission of air near thercircumference of the fan, and admit the full or near the full amount of air at the centre of` the fan, substantially as specified.

4. Carrying chaff and other impurities over or `away, by means of a ribbed roller, K, substantially as specified.

5. The concave board P, for receiving grain and impurities, and holding the same in the blast u'ntil the good grain-backs oli', vwhile the impurities are carried along with the blast, substantially as set forth.

6. The metallic comb L, used in the manner and for' the purposes spec'iied.

' JOHN W. GARVER. y

CHARLES A. BIKLE. Witnesses:

NnTHANmL SEHNER, GHnIs'rLAN F. Brunn. 

